|
Problem IC78131
|
Status: Closed |
THE VALUE FOR STATISTICS_TIME COLUMN IN EXPLAIN TABLE EXPLAIN_OBJECT CAN BE TRUNCATED. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
The value for STATISTICS_TIME column in EXPLAIN Table
EXPLAIN_OBJECT can be truncated.
Reproduction:
db2sampl -xml -sql
db2 connect to sample
db2 -tvf C:\progra~1\IBM\sqllib_02\misc\EXPLAIN.DDL
db2 "RUNSTATS ON TABLE DB2ADMIN.STAFF WITH DISTRIBUTION ON ALL
COLUMNS"
db2 "RUNSTATS ON TABLE DB2ADMIN.STAFF FOR INDEXES ALL"
db2level
db2 "EXPLAIN PLAN FOR SELECT * FROM DB2ADMIN.STAFF"
C:\tmp>db2 "SELECT SUBSTR(TABNAME,1,40) AS NAME, STATS_TIME FROM
SYSCAT.TABLES WHERE TABNAME ='STAFF'"
NAME STATS_TIME
----------------------------------------
--------------------------
STAFF
2011-08-11-15.26.03.456000
1 record(s) selected.
C:\tmp>db2 "SELECT SUBSTR(OBJECT_NAME,1,40) AS NAME,
STATISTICS_TIME FROM DB2ADMIN.EXPLAIN_OBJECT"
NAME STATISTICS_TIME
----------------------------------------
--------------------------
STAFF
2011-08-11-00.00.00.000000
1 record(s) selected. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* all *
****************************************************************
* PROBLEM DESCRIPTION: *
* THE VALUE FOR STATISTICS_TIME COLUMN IN EXPLAIN TABLE *
* EXPLAIN_OBJECT CAN BE TRUNCATED. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 v9.7 Fixpack 6. *
**************************************************************** |
| Local Fix: |
|
| available fix packs: |
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
First fixed in DB2 v9.7 Fixpack 6.
- The lack of precision in the statistics times stored in the
packed descriptor should not have any adverse effect on general
database operations.
- Refresh the metadata, for example, via RUNSTATS, only if the
incorrect stats time seen in the explain tables is something
that you want to resolve; otherwise, let your current statistics
collection procedure refresh the metadata over time. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 15.08.2011
04.06.2012
04.06.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP6
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.6
|
 |
